Datasheet ALT80600 (Allegro) - 6

LED Driver with Pre-Emptive Boost ALT80600 for Ultra-High Dimming Ratio and Low Output Ripple ELECTRICAL CHARACTERISTICS [1]: Unless otherwise noted, specifications are valid at VIN = 16 V, TJ = 25°C, • indicates specifica- tions guaranteed over the full operating temperature range with TJ = –40°C to 125°C, typical specifications are at TJ = 25°C Characteristics Symbol Test Conditions Min. Typ. Max. Unit INPUT VOLTAGE SPECIFICATIONS
Operating Input Voltage Range [3] VIN ● 4.5 − 40 V VIN UVLO Start Threshold VUVLO(rise) VIN rising ● − – 4.35 V VIN UVLO Stop Threshold VUVLO(fall) VIN falling ● − – 3.9 V UVLO Hysteresis [2] VUVLO_HYS 300 450 600 mV
INPUT CURRENTS
VIN Pin Operating Current IOP EN and PWM = H, fSW = 2 MHz ● − 13 18 mA VIN Pin Quiescent Current IQ EN = H and PWM = L, fCLKOUT = 2 MHz ● − 10 − mA VIN Pin Sleep Current IQSLEEP VIN = 16 V, VEN = 0 V ● − 2 10 µA
INPUT LOGIC LEVELS (EN, PWM, APWM)
Input Logic Level-Low VIL ● − − 0.4 V Input Logic Level-High VIH ● 1.5 − − V Input Pull-Down Resistor REN, RPWM, R Input = 5 V 60 100 140 kΩ APWM
OUTPUT LOGIC LEVELS (CLKOUT)
Output Logic Level-Low VOL 5 V < VIN < 40 V ● − − 0.3 V Output Logic Level-High VOH 5 V < VIN < 40 V ● 1.8 − − V CLKOUT Duty Cycle DCLKOUT fSW = 2 MHz, no external sync ● 33 50 67 % CLKOUT Negative Pulse Width [2] DCLKNPW External sync = 200 kHz to 2.3 MHz − 200 − ns
APWM PIN
APWM Frequency Range [2] fAPWM Clock signal applied to pin ● 40 − 1000 kHz APWM Duty Cycle Range [2] DAPWM Clock signal applied to pin ● 0 − 90 %
VDD REGULATOR
Regulator Output Voltage VDD VIN > 4.5 V, iLOAD < 1 mA 4.05 4.25 4.45 V VDD UVLO Start Threshold VDDUVLOrise VDD rising, no external load 3.2 V VDD UVLO Stop Threshold VDDUVLOfall VDD falling, no external load 2.65 V
ERROR AMPLIFIER
Amplifier Gain [2] Gm VCOMP = 1.5 V − 1000 − μA/V Source Current IEA(SRC) VCOMP = 1.5 V − –600 − μA Sink Current IEA(SINK) VCOMP = 1.5 V − +600 − μA COMP Pin Pull Down Resistance RCOMP FAULT = 0, VCOMP = 1.5 V − 1.4 − kΩ Continued on the next page… Allegro MicroSystems, LLC 6 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com Document Outline Features and Benefits Description Applications Package Selection Guide Absolute Maximum Ratings Thermal Characteristics Typical Application – SEPIC Functional Block Diagram Pinout Diagram and Terminal List Electrical Characteristics Functional Description Enabling the IC Powering Up: LED Detection Phase Powering Up: Boost Output Undervoltage Soft Start Function Frequency Selection Synchronization Loss of External Sync Signal Switching Frequency Dithering Clock Out Function LED Current Setting PWM Dimming Pre-Emptive Boost (PEB) Analog Dimming with APWM Pin Extending LED Dimming Ratio Analog Dimming with External Voltage VDD Shutdown Fault Detection and Protection LED String Partial-Short Detect Boost Switch Overcurrent Protection Input Overcurrent Protection and Disconnect Switch Setting the Current Sense Resistor Input UVLO Fault Protection During Operation Fault Recovery Mechanism Package Outline Drawing Appendix A: Design Example